This is a 30-day free trial for new users, or initial download or free update for licensed users.

There is really only one version of the software. With no license key installed, it runs in time-limited trial mode. Installing a license key unlocks features for unlimited use.

Note: Due to its relatively small distribution, Zerene Stacker is sometimes identified by malware protection software as “untrusted”. We have also seen a small but increasing number of false-positive indications where a Zerene Stacker installer was erroneously identified as containing some sort of malware. If you have any difficulties with installation, or any security concerns about the installers, please see How To Validate A Download and/or contact support@zerenesystems.com for help.

The current production version of Zerene Stacker is Build T201711041830 (November 4, 2017), as follows:

Mac OS X: ZS-MacOSX-SA-T201711041830.zip, downloads as an application bundle named ZereneStacker (.app).
This is the recommended bundle for modern Macs. It is self-contained and includes its own Java 8 runtime environment, which will be used with Mac OS X 10.7.3 and above. With older versions of Mac OS X, it will use whatever /usr/bin/java is already installed on the computer, but will not request installation of Java if none is currently available. This bundle requires 64-bit Mac OS X. Length 67,173,561 bytes
MD5 checksum b0b878740826f47087cdd5dc19e3fb16
SHA-1 checksum 9355594cf1d3ff62ab56619275bfd7860c45f169

Mac OS X (old): ZS-MacOSXold-SA-T201711041830.zip, downloads as an application bundle named ZereneStacker (.app).
This bundle is not self-contained. It requires a Java runtime environment installed by Apple, and will prompt for installation of Java if one is not already installed. It runs as 64-bit where the processor and operating system support it, and as 32-bit otherwise. Length 8,529,389 bytes
MD5 checksum feab7fec75f4cc39216741e17ccb6d61
SHA-1 checksum f170f4c8859165c88597cf0522d954bef22391ad